jenna: another big story today, a change of command in afghanistan. general john allen taking control over the international alliance over general david petraeus who will take charge of the cia soon. jennifer griffin is live at pentagon with more. >> reporter: the changes, the command ceremony in kabul took place with a backdrop of a slew of attacks on karzai's circle. there is a warning that the war in afghanistan is far from over. >> the job is most certainly not done. al-qaida operatives still plot and plan across the border in pakistan. the taliban still try to regain lost ground, still intimidate and still assassinate as we just saw this past week about the brutal killing of president karzai's brother. hamid karzai trying to climb into his brother's grave last week is facing almost daily challenges to his rule. his brother was assassinated by a trusted bodyguard. a former governor and loyal political adviser to karzai was assassinate ned his apartment by two taliban gunman wearing bomb belts. >> in crushing heat and in numbing cold from the deser